DE2137893C3 - Annäherungs-Signalgeber - Google Patents

Annäherungs-Signalgeber

Info

Publication number
DE2137893C3
DE2137893C3 DE2137893A DE2137893A DE2137893C3 DE 2137893 C3 DE2137893 C3 DE 2137893C3 DE 2137893 A DE2137893 A DE 2137893A DE 2137893 A DE2137893 A DE 2137893A DE 2137893 C3 DE2137893 C3 DE 2137893C3
Authority
DE
Germany
Prior art keywords
circuit
signal
voltage
transistor
oscillator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DE2137893A
Other languages
German (de)
English (en)
Other versions
DE2137893A1 (de
DE2137893B2 (de
Inventor
Richard Melvin Jepperson
Charles Warren Simmonds
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crane Products Manufacturing Co Inc Las Vegas Nev (vsta)
Original Assignee
Crane Products Manufacturing Co Inc Las Vegas Nev (vsta)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Crane Products Manufacturing Co Inc Las Vegas Nev (vsta) filed Critical Crane Products Manufacturing Co Inc Las Vegas Nev (vsta)
Publication of DE2137893A1 publication Critical patent/DE2137893A1/de
Publication of DE2137893B2 publication Critical patent/DE2137893B2/de
Application granted granted Critical
Publication of DE2137893C3 publication Critical patent/DE2137893C3/de
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Emergency Alarm Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Control And Safety Of Cranes (AREA)
  • Burglar Alarm Systems (AREA)
  • Jib Cranes (AREA)
DE2137893A 1971-04-19 1971-07-29 Annäherungs-Signalgeber Expired DE2137893C3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13534771A 1971-04-19 1971-04-19

Publications (3)

Publication Number Publication Date
DE2137893A1 DE2137893A1 (de) 1972-11-09
DE2137893B2 DE2137893B2 (de) 1979-04-19
DE2137893C3 true DE2137893C3 (de) 1979-12-06

Family

ID=22467692

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2137893A Expired DE2137893C3 (de) 1971-04-19 1971-07-29 Annäherungs-Signalgeber

Country Status (8)

Country Link
US (1) US3745549A (ja)
JP (1) JPS53152587U (ja)
AU (1) AU474202B2 (ja)
CA (1) CA963553A (ja)
DE (1) DE2137893C3 (ja)
FR (1) FR2134977A5 (ja)
GB (2) GB1367641A (ja)
NL (1) NL7111829A (ja)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4362992A (en) * 1978-01-30 1982-12-07 Sperry Limited System and method of detecting the proximity of an alternating magnetic field
US4727447A (en) * 1982-12-20 1988-02-23 Texaco Inc. Safety system and method
US4683464A (en) * 1983-06-30 1987-07-28 Texaco Inc. Safety monitor means and method
US4649375A (en) * 1985-10-31 1987-03-10 Fmc Corporation Apparatus for detecting power lines
FR2608781B1 (fr) * 1986-12-17 1989-03-03 Thomas Jean Detecteur de proximite entre une masse metallique et un element sous tension electrique
US5485092A (en) * 1991-08-01 1996-01-16 Fortin; Gabriel Method and device for electrostatically investigating surface and sub-surface structures
USD383076S (en) * 1995-07-24 1997-09-02 Cripe Rodney J Emergency vehicle proximity alarm system
US5910775A (en) * 1996-08-29 1999-06-08 S&C Electric Company Phasing and indicator arrangements for switchgear or the like
US6002348A (en) * 1998-05-13 1999-12-14 Safe Flight Instrument Corporation Pilot's aid for detecting power lines
US6124798A (en) * 1998-12-09 2000-09-26 Institute Of Occupational Safety And Health, Council Of Labor Affairs, Executive Yuan Alarm device designed to warn of danger of hitting high voltage power line by crane in motion
US6600426B1 (en) 1999-10-04 2003-07-29 The United States Of America As Represented By The Department Of Health And Human Services Alarm system for detecting hazards due to power transmission lines
US6853307B2 (en) * 2002-03-14 2005-02-08 Irvin H. Nickerson High voltage proximity warning system and method
US20070018841A1 (en) * 2004-11-22 2007-01-25 Nickerson Irvin H High voltage proximity warning system utilizing wireless sensors and method
US8477027B2 (en) * 2007-10-24 2013-07-02 Gerald E. Givens Wireless sensor system
US20090108840A1 (en) * 2007-10-24 2009-04-30 Givens Gerald E Power Line Sensor
US8786447B1 (en) 2012-02-26 2014-07-22 Bryan C. Wise High voltage detection assembly

Also Published As

Publication number Publication date
FR2134977A5 (ja) 1972-12-08
GB1367641A (en) 1974-09-18
JPS53152587U (ja) 1978-12-01
DE2137893A1 (de) 1972-11-09
DE2137893B2 (de) 1979-04-19
US3745549A (en) 1973-07-10
AU3135971A (en) 1973-01-25
CA963553A (en) 1975-02-25
GB1367642A (en) 1974-09-18
NL7111829A (ja) 1972-10-23
AU474202B2 (en) 1976-07-15

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
EGA New person/name/address of the applicant
8339 Ceased/non-payment of the annual fee